I understand that the injectors should have 12V when the key is on. They do

I know the ECM grounds out the injectors to fire them. I'm curious how to monitor the ignition pulse wire to the ECM that controls the injectors.. Is it a open/close loop for the pulse wire from distributor to ecm, or is it putting resistance on it?

I believe it's open/close, controlled from the injector driver in the ecm. You should be able to check it with one of those little "peanut" lights(#194?) just bend out the prongs and plug them into the injector plug on the wire off of the injector. It should show if you have + and a good ground. Also, what's your fuel pressure, I think it should be like 34-47????

Notice that BOTH have a 4 wire connector? the TPI needs to know what the distrib is doing in order to place its port time in sequence. without the trigger wires to the computor you are dead in the water. from what I talked to cc about last night in chat he didn't have any of the 4 wires hooked up.